Philips Semiconductors

Product specification

80C851/83C851

CMOS single-chip 8-bit microcontroller

with on-chip EEPROM

1998 Jul 03

13

24 MHz Version

24MHz CLOCK

VARIABLE CLOCK

SYMBOL

FIGURE

PARAMETER

MIN

MAX

MIN

MAX

UNIT

4

Oscillator frequency

3.5

24

MHz

4

ALE pulse width

43

ns

4

Address valid to ALE low

17

ns

4

Address hold after ALE low

17

ns

4

ALE low to valid instruction in

102

ns

4

ALE low to PSEN low

17

ns

4

PSEN pulse width

80

ns

4

PSEN low to valid instruction in

65

ns

4

Input instruction hold after PSEN

0

0

ns

4

Input instruction float after PSEN

17

ns

4

Address to valid instruction in

128

ns

4

PSEN low to address float

10

10

ns

Data Memory

5

RD pulse width

150

ns

5

WR pulse width

150

ns

5

RD low to valid data in

118

ns

5

Data hold after RD

0

0

ns

5

Data float after RD

55

ns

5

ALE low to valid data in

183

ns

5

Address to valid data in

210

ns

5, 6

ALE low to RD or WR low

75

175

ns

5, 6

Address valid to RD or WR low

92

ns

6

Data setup time before WR

162

ns

6

Data valid to WR transition

12

ns

6

Data hold after WR

17

ns

5

RD low to address float

0

0

ns

5, 6

RD or WR high to ALE high

17

67

ns

External Clock

8

High time

17

17

ns

8

Low time

17

17

ns

8

Rise time

5

20

ns

8

Fall time

5

20

ns

Erase/write cycle time

4

20

4

20

ms

Erase time

2

10

2

10

ms

Write time

2

10

2

10

ms

10

10

years

NE/W

10,000

10,000

cycles

NOTES:

1. Parameters are valid over operating temperature range unless otherwise specified.

2. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.

to prevent this condition from occurring.

5. Number of erase/write cycles for each EEPROM byte.